Dear Samsung Member,
Greetings from Samsung Customer Support!
We apologize for the inconvenience caused to you. Kindly follow below given steps in order to resolve the issue:-
1. Reset and set new APN:- Settings >Connections >Mobile networks >Access point name >Reset to defaults >Reset.
How to set new APN :- Settings >Connections >Access point name >ADD >Tap on Name >Enter the Name >Tap on OK >Tap on APN >Enter the APN >Tap on OK >Tap on Menu >Tap on Save.
2. Reset the device - Before resetting, kindly create data backup of your device via SMART switch mobile application or http://www.samsung.com/in/support/smartswitch pc suite.
How to reset: Settings>General Management>Reset>Reset settings: Reset all settings to their default.
After performing above steps if the issue still persist kindly send us the screenshot, videos and error log file with in 15 minutes of issue occurrence through error report section from Samsung Member Application:- Samsung Member Application > click on get help > send feedback > error report, so that we can help you out to solve the issue.
Thank you for writing to Samsung.
Samsung Customer Support